JPH10329831A - Can with hologram and production thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To form satisfactorily a relief-type hologram on the surface of the cylindrical body of a can without increasing manufacturing processes very much and decreasing work efficiency drastically for a metal can. SOLUTION: In a film-stuck can 1, in which a transparent thermoplastic resin film 21 with a printed layer 22 made on the surface of its one side is stuck to the periphery of a cylindrical body 11 by heat bonding via a bonding layer formed so as to cover the printed layer 22, relief-type hologram 21a consisting of recesses and projections with extremely small empty spaces between them is formed partially or entirely on the surface of the thermoplastic resin film 21, which is opposite the side where the printed layer 22 is made.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a metal can used as a container for beverage cans, and more particularly, to a hologram-provided can provided with a hologram on a surface of a can body portion of the can. The present invention relates to a method for manufacturing such a hologram can.

[0002]

2. Description of the Related Art Metal can bodies used as containers for beverage cans are used for a cylindrical can body for a two-piece can, and for a metal plate serving as a can body for a three-piece can. The characters and decorative patterns of various colors and designs are applied in advance by direct printing or pasting a printed resin film, etc. As letters and decorative patterns on the torso,
Further, since there is a demand for a new color and design with a noticeable color, it has been proposed to apply a hologram to the surface of the can body of the can body.

[0003] That is, it has been conventionally proposed that a hologram having a decorative property that slightly changes depending on the viewing angle and shines in a rainbow color is used for a packaging material or a container (for example, an actual hologram). Kaisho 61-
No. 103010, Japanese Utility Model Application Laid-Open No. Sho 62-189013, Japanese Utility Model Application Laid-Open No. Sho 62-143663, Japanese Utility Model Application Laid-Open No. Sho 63-70935, etc.), and in a metal can body as a canned container, a It has already been proposed to provide a hologram. (JP-A-2-32946,
(See Japanese Patent Application Laid-Open No. 6-278751)

[0004]

The method of imparting a hologram to a metal can as described above is disclosed in JP-A-2-32946, that is, a relief hologram is provided on the metal surface of the can. In the direct transfer method, a tool surface in which interference fringes corresponding to a wavefront of light from a document to be expressed as an image are formed on a hologram in an uneven shape is engaged with a metal surface to be processed. A relief hologram is formed directly on the metal surface.

For this reason, it takes a long time to manufacture, and, for example, when a hologram is formed on a flat metal surface and then rounded into a cylinder to form a can body, an excessively large metal surface on which the hologram is formed is formed. I will put a load,
While the hologram may be adversely affected, when the hologram is formed on a curved metal surface after the cylindrical body is formed, the work of engaging the cylindrical surface with the tool must be performed very delicately and accurately. It has to be performed, and there is a problem that work efficiency is greatly reduced.

In addition, the above publication states that the hologram may be transferred before or after printing. However, printing should not be performed on the metal surface where the hologram is to be transferred. Also, since the hologram should not be printed on the transferred hologram, the hologram can be accurately transferred during printing / painting and hologram transfer regardless of whether the hologram is transferred before or after printing. It is necessary to perform accurate positioning, and the work is troublesome, resulting in a further reduction in work efficiency.

Further, the metal surface on which the hologram is transferred is
Since it will rust as it is, it is necessary to cover it with a transparent coating, and if a hologram is formed after printing, a coating process and a drying process for protecting the hologram will be added in addition to a coating process and a drying process for protecting the printed layer Therefore, the cost becomes considerably high.

In order to solve such a problem, a method of forming a hologram on a curved surface of a cylindrical can body by thermal transfer from a transfer sheet having a hologram forming layer, that is, a base film Prepare a transfer sheet in which a release layer, a protective layer, a hologram forming resin layer (light diffraction pattern forming resin layer), a light-reflecting thin film layer, and a heat-sensitive adhesive layer are laminated in this order. An activated base coat layer is formed on the surface of the can body, and at a portion corresponding to the convex portion of the transfer rotary plate, a laminated portion other than the base film in the transfer sheet is peeled off to form a base coat layer. A method of performing thermal transfer to a surface has already been proposed by the present applicant and the like. (See Japanese Patent Application Laid-Open No. 6-278751)

However, in the method by thermal transfer using such a transfer sheet, many steps are required to manufacture the transfer sheet itself, and it is necessary to form a base coat layer on the can body portion of the can body. In addition, it is necessary to thermally transfer the laminated portion including the hologram-forming resin layer of the transfer sheet from the base film of the transfer sheet to the can body of the can body by using the transfer rotary plate. In addition, there is a problem that productivity is reduced due to a large increase, and further, when a laminated portion including a hologram-forming resin layer is transferred to a part of a can body, at the time of transfer, a portion where a hologram is transferred and its surroundings. However, there is a problem that it is necessary to accurately align the print pattern with the print pattern, and thus the production speed is greatly reduced.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and is intended to reduce the working efficiency of a metal can without significantly increasing the number of manufacturing steps. It is another object of the present invention to form a relief hologram satisfactorily on the surface of a can body of the can body.

[0011]

According to the present invention, there is provided a transparent thermoplastic resin having a printed layer on one surface as described in claim 1 to solve the above-mentioned problems. In a film-attached can body in which a resin film is adhered to the outer peripheral surface of the can body by thermal bonding via an adhesive layer applied so as to cover the print layer, the side on which the print layer is applied The relief hologram is formed on the surface of the thermoplastic resin film on the opposite side from the above, partially or entirely, with relief holograms formed by irregularities at extremely fine intervals.

Further, as described in claim 2 above,
A transparent thermoplastic resin film provided with a print layer on one surface and a top coat layer of a transparent thermosetting resin containing a lubricant on the other surface covers the print layer. Through the adhesive layer applied as described above, in a film-adhered can body stuck to the outer peripheral surface of the can body by thermal bonding,
A relief hologram is formed on the surface of the top coat layer, partially or entirely, with irregularities at extremely fine intervals.

[0013] Further, as a method for manufacturing a can body with a hologram as described in claim 1, as described in claim 3, one side of a long transparent thermoplastic resin film is used. A step of sequentially applying a printing layer of a printing ink and an adhesive layer of an adhesive on the surface to form a printing film for sticking a can body, and applying the printing film for sticking a can body to a long can body through the adhesive layer. A step of heating and bonding to a metal plate, a step of cutting the metal plate for a can body to which a printing film for sticking a can body is adhered, and cutting it into a blank for a can body having a size of one can, A method for manufacturing a can body having a side seam portion, comprising: a can body forming step in which a blank is rolled by a can body forming machine to overlap both ends, and a joining step of joining an overlapped portion of the can body. For forming a printed film for sticking a can body , A roll type hologram stamper in which a relief hologram formed by irregularities at extremely fine intervals is formed on at least a part of a cylindrical surface is pressed against the surface of the thermoplastic resin film opposite to the print layer forming side. By doing so, a relief-type hologram is formed on the surface of the thermoplastic resin film.

Further, as a method for manufacturing a can body with a hologram as described in claim 1, as described in claim 4, one side of a long transparent thermoplastic resin film is used. A step of forming a printing film for sticking a can body by sequentially applying a printing layer of printing ink and an adhesive layer of an adhesive on the surface, and a step of cutting the printing film for sticking a can body to a size of one can And a step of manufacturing a can body having no side seam portion from a metal plate for manufacturing a can body, and after heating the can body having no side seam portion, a printing film for sticking a can body for one can is bonded to the adhesive layer. Attaching the film to the body of the can body by wrapping the film on the body of the can body so that the film comes into contact with the can body, and applying pressure to the body of the can body. Forming a can body-adhering print film in the method , A roll type hologram stamper in which a relief hologram formed by irregularities at extremely fine intervals is formed on at least a part of a cylindrical surface is pressed against the surface of the thermoplastic resin film opposite to the print layer forming side. By doing so, a relief-type hologram is formed on the surface of the thermoplastic resin film.

According to a fifth aspect of the present invention, there is provided a method for manufacturing a can body with a hologram as described in the second aspect. In the method of manufacturing, the surface of the transparent thermoplastic resin film on the side of forming the relief hologram, in advance, a transparent thermosetting resin paint containing a lubricant is applied and dried, the top coat layer Is formed in advance.

Further, as a method for manufacturing a can body with a hologram as described in claim 1 or 2, as described in claim 6, as described in claim 6, a hologram with a hologram as described in claims 3 to 5 is provided. In the method for manufacturing a can body, printing on a transparent thermoplastic resin film is continuous printing of a repetitive pattern extending in the longitudinal direction of the long film, and non-printing of narrow width on both sides of the continuous printing portion. And a plurality of continuous printing portions provided with a non-printing portion therebetween.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of a can body with a hologram and a method of manufacturing the same according to the present invention will be described below in detail with reference to the drawings.

FIG. 1 shows (A) a partial cross section of a can body portion of a film-attached can body according to an embodiment (first embodiment) of a can body with a hologram of the present invention,
(B) is an enlarged view of the cross section.
Is a printing film in which a printing plate 12 made of a resin-made can-body sticking which has been printed in advance is integrally bonded by thermal bonding to a metal plate 11 forming a portion of a can body without directly printing. It is a sticking can body.

The can body sticking printing film 12 attached to the metal plate 11 of the can body has a transparent thermoplastic resin film 21 as a main body, and the back surface of the thermoplastic resin film 21 (adhered to the can body). Side), a printing layer 22 and an adhesive layer 23 are sequentially formed, and a relief hologram 21a is formed on the entire surface or most of the surface of the thermoplastic resin film 21 by irregularities with extremely fine intervals. Have been.

FIG. 2 shows another embodiment (second embodiment) of a can body with a hologram according to the present invention, which shows a portion similar to that of FIG. 1 (B). A printing layer 22 made of a plurality of printing inks and an adhesive layer 23 made of an adhesive are sequentially formed on the back surface of a transparent thermoplastic resin film 21 serving as a main body of the thermoplastic resin film 21. On the surface, a top coat layer 24 of a transparent thermosetting resin containing a lubricant is formed, and on the surface of the top coat layer 24, as in the above-described first embodiment, an extremely fine gap is formed. A relief hologram 24a is formed by unevenness.

The materials used to form each part of the can 1 in each embodiment of the can with hologram as described above are as follows.

The metal plate 11 forming the can body of the can body 1 includes cold-rolled sheet, hot-dip zinc and zinc alloy-plated steel sheet, electric zinc and zinc alloy-plated steel sheet, tinplate, ultra-thin tin-plated steel sheet, tin-free steel, Chrome-plated steel plate, aluminum-plated steel plate, nickel-plated steel plate, various other alloy-plated steel plates, aluminum alloy plate, other metal plates,
If necessary, a chemical conversion treatment such as a phosphate treatment, a chromate treatment, an organic chromate treatment, a cobalt composite oxide film treatment, a nickel displacement plating, and other treatments can be used.

The thermoplastic resin film 21 serving as the main body of the film 12 for attaching a can body has a relatively high transparency, such as a polyester film, a nylon film, and a polypropylene film having a thickness of 10 to 30 μm, and has excellent heat resistance. For example, a polyester film containing ethylene terephthalate and ethylene isophthalate as main components and having a melting point of 160 to 255 ° C. is used.

That is, when the melting point is below 160 ° C., the relief hologram 2
After forming 1a on the surface of the thermoplastic resin film 21,
The hologram 21 formed on the surface of the thermoplastic resin film 21 in the attaching step to the metal plate 11 by thermal bonding
This is because there is a possibility that the uneven shape of a may disappear.

When a polyester film is used as the thermoplastic resin film 21, other components may be copolymerized as long as the characteristics of the present invention are not impaired. For example, the dicarboxylic acid component to be copolymerized may be naphthalenedicarboxylic acid. , Diphenyldicarboxylic acid, diphenylsulfonedicarboxylic acid, diphenoxyethanedicarboxylic acid, 5-sodium sulfoisophthalic acid, aromatic dicarboxylic acids such as phthalic acid, oxalic acid, succinic acid, adipic acid, sebacic acid, dimer acid, maleic acid, Examples thereof include aliphatic dicarboxylic acids such as fumaric acid, alicyclic dicarboxylic acids such as cyclohexanedicarboxylic acid, and oxycarboxylic acids such as p-oxybenzoic acid.

The glycol components to be copolymerized include aliphatic glycols such as propanediol, butanediol, pentanediol and neopentyl glycol.
Examples thereof include alicyclic glycols such as cyclohexanedimethanol, aromatic glycols such as bisphenol A and bisphenol S, and polyoxyethylene glycols such as diethylene glycol and polyethylene glycol. In addition, about the said dicarboxylic acid component and a glycol component, you may use 2 or more types together.

When a nylon film is used as the thermoplastic resin film 21, a condensation polymer of a diamine and a dicarboxylic acid such as nylon 66, nylon 610 and nylon 612, or nylon 6, nylon 11 and nylon 12 may be used. Any of the lactam ring-opening polymers can be used.

The printing layer 22 applied to the back side of the thermoplastic resin film 21 is made of an ink composed of a thermosetting urethane resin. The printing method includes gravure printing, flexographic printing, offset printing, and the like. Printing, etc.
Various printing methods can be selected as appropriate. However, when it is desired to print rich characters and patterns with rich colors and rich colors, it is preferable to form the print layer 22 by gravure printing.

The adhesive layer 23 applied from the upper side of the printed layer 22 (from the side opposite to the thermoplastic resin film 21 in the thickness direction of the printed layer 22) so as to cover the printed layer 22 is heated and heated. It is formed by an adhesive of a thermosetting resin which is easily adhered by pressure and has good adhesion to the ink used for the printing layer 22. As such an adhesive, polyester is a main component. And an EB-curable (electron-curable) resin can be used in combination as another curable resin component.

The polyester resin used for the adhesive is a conventionally known condensate of a polybasic acid and a polyhydric alcohol, and is a thermoplastic resin having a number average molecular weight of 7,000 to 4,
The polyester resin is produced by mixing the following acid component and alcohol component in a reaction vessel at a temperature of 200 ° C. to 250 ° C., preferably in the range of 10,000 to 30,000. By condensation polymerization.

Examples of the polybasic acids used for producing the polyester resin include aliphatic dibasic acids such as adipic acid, suberic acid, azelaic acid, sebacic acid, decane-1,10-dicarboxylic acid, and hexahydrophthalic acid. , Hexahydrotrimellitic acid, tetrahydrophthalic acid and other alicyclic polybasic acids and their anhydrides, phthalic acid, isophthalic acid, terephthalic acid, trimellitic acid, pyromellitic acid and other aromatic polybasic acids, and the like Anhydrides and others, maleic acid, fumaric acid, itaconic acid and the like can be mentioned.

Examples of the polyhydric alcohol used for producing the polyester resin include ethylene glycol, propylene glycol, diethylene glycol, 1.2-butylene glycol, 1.6-hexanediol, 1.4-cyclohexanedimethanol, and neopentyl. Glycol, polylactone diol and the like can be mentioned.

As the thermosetting component used in the adhesive, melamine resin, guanamine resin, amino resin such as urea resin, and phenol resin can be used.
As the isocyanate curing, aromatic isocyanate such as tolylene diisocyanate (abbreviation: TDI), 4.4 'diphenylmethane diisocyanate (MDI), or hexamethylene diisocyanate (HMD)
Aliphatic isocyanates such as I), isophorone diisocyanate (IPDI) and xylene diisocyanate (XDI) can be used.

The EB-curable (electro-curable) resin used for the adhesive has a number average molecular weight of 300 to 5,
000, preferably 1,000 to 2,000 polyester-based oligomers, each of which has a polymerizable unsaturated content of 0.3 to 5.0 mol / kg molecule, preferably 1.0 to 3.0 mol / kg molecule. It has a double bond.

As the polyester-based oligomer,
Examples thereof include a low molecular weight polyester having a number average molecular weight of 5,000 or less, in which (meth) acrylic acid is ester-bonded to a low molecular weight polyester having a hydroxyl group. It is obtained by combining alcohol.

Examples of the stress relaxing agent to be incorporated in the above-mentioned thermosetting resin containing polyester as a main component (EB curing may be used in combination) include silica, bentonite, clay, talc, barium sulfate, calcium carbonate and the like. When coloring (for example, white) is required, titanium oxide can be contained.

Further, in the can body shown in the second embodiment, the top coat layer 24 formed on the surface of the transparent thermoplastic resin film 21 imparts lubricity to the can body surface of the can body. Therefore, as a transparent thermosetting resin containing a lubricant, a thermosetting resin such as an epoxy-amino resin, an epoxy-melamine resin, or a polyester-amino resin is used as a transparent thermosetting resin such as silicone or wax. What mixed a sexual agent is used.

As the main resin of the top coat, a polyester resin, an acrylic resin, an epoxy resin, or the like can be used. As the curing agent, an amino resin such as a melamine resin, a phenol resin, or the like can be used. Further, as the lubricant, lanolin, carnauba, paraffin, polyethylene, PTFE (ethylene tetrafluoride resin), silicones such as polyether-modified dimethylsilane, silica, and the like are effective.

The method of manufacturing the hologram-provided can body of each embodiment made of each of the above materials will be described below.

First, the embossed hologram mold is exposed to laser interference fringes on a dry plate coated with a photoresist by a conventional method to form a resist having irregularities corresponding to the intensity of the interference. Next, a metal is vapor-deposited on this, a film is formed to have conductivity, nickel is plated thereon, and then the plating layer is peeled off from the original plate, so that extremely fine irregularities can be accurately copied. Manufactures embossed hologram molds.

Even if the embossed hologram mold produced by the known method is repeatedly hot-pressed on the surface of a long film made of a thermoplastic resin as it is, the surface of the film has extremely fine irregularities. A long film in which a hologram is repeatedly reproduced can be obtained, but the processing speed cannot be increased by such a stamping process using an embossed hologram mold itself.

For this reason, in the manufacturing method of the present embodiment, the embossed hologram mold is provided on a part or the whole of the rotating outer peripheral surface of the metal jacket roll which can be heated by an induction heating method or a means such as flowing a heating fluid inside. The embossed hologram processing metal jacket roll is embossed, as shown in FIG. 3, as shown in FIG. 3, between a long roll of a thermoplastic resin film and a take-up roll, that is, a long roll. It is provided in the middle of a processing line for forming a printing layer and an adhesive layer on a thermoplastic resin film.

As a result, the continuously running 12 μm
A metal jacket roll in which a relief type hologram is formed on at least a part of an outer peripheral surface of a rotating roll on a surface of a long film made of a thermoplastic resin having a thickness of m by using a metal jacket roll. Embossed hologram processing for repeatedly forming holograms is performed simply and at high speed, and the printing layer 22 is formed on the surface (rear surface) of the long film that is not the embossed hologram surface.
And an adhesive layer 23.

In this case, for the structure shown in the first embodiment, as shown in FIG. 4, the step of applying a top coat with a transparent thermosetting resin paint is omitted, and The relief hologram 21a is formed directly on the surface, and the structure shown in the second embodiment has the structure shown in FIG. After forming a top coat layer 24 of a paint, a relief hologram 24a is formed on the surface of the top coat layer 24.
Is formed.

That is, in the case of manufacturing the structure shown in the second embodiment, first, a long thermoplastic resin film unwound from a coil wound state and fed out by a feeding roll is first exposed to the surface thereof. On the side, apply a top coat resin, which is a transparent thermosetting resin paint containing a lubricant, by using a gravure roll (a roll with extremely small concave portions formed on the surface), and then heat dry. Thus, the top coat layer 24 is continuously and repeatedly formed on the long film.

On the other hand, when manufacturing the structure having the structure shown in the first embodiment, the step for forming the top coat layer 24 as described above is omitted. The cost of can making can be reduced by omitting the paint for forming the layer 24 and the coating step.

Then, the relief hologram on the outer peripheral surface of the roll is heated by a metal jacket roll formed on at least a part of the outer peripheral surface on which the relief type hologram having the uneven shape is rotated. While pressing the long film against the surface (the surface of the thermoplastic resin film 21 in the first embodiment, the surface of the top coat layer 24 in the second embodiment), the length of the long film is reduced. A relief hologram is repeatedly formed on the front side of the measuring film.

The pitch of the relief hologram formed on the film surface by such embossed hologram processing is in the range of 0.1 μm to 2 μm. Is preferably in the range of 0.3 μm to 1 μm. In addition, whether such embossed hologram processing is performed on the entire surface of the long film, or whether the surface of the film is partially and repeatedly performed,
It can be arbitrarily selected.

Next, the surface (rear surface) of the long film with the embossed hologram, which is not the hologram surface, is printed with printing ink such as gravure or flexo using printing ink of 3 to 8 colors by a printing roller. After performing the multi-color printing by sequentially repeating the back printing, the adhesive layer is further applied by an adhesive applying roller so that the printing layer 22 is entirely covered from above. After the printing layer 22 and the adhesive layer 23 are dried by heating, the coil is wound as a long film having been printed and formed into a hologram by a winding roll.

When the embossed hologram is partially applied to the surface of the long film, it is necessary to align the position where the embossed hologram is formed with the printed pattern on the back surface. In the original printing, the position of the ink pattern of each color is adjusted so that it is printed at a predetermined position, so by performing the same operation as that of the alignment, the embossed hologram and the printed pattern are printed. Can be easily adjusted.

That is, a predetermined position (a height of a can or a circumferential length) is previously set on the surface of the metal jacket roll at a predetermined position which is aligned with the printed pattern.
After forming a relief type hologram with a predetermined width with irregularities at extremely fine intervals, after forming an embossed hologram on the surface of a long resin film running continuously using this metal jacket roll, Before printing, for example,
While the long resin film is running in the horizontal direction, a laser slit light (having a width sufficiently longer than the width of the embossed hologram) is applied to the film surface on the side of the embossed hologram at a predetermined angle. .

At the same time, a licensor camera (having a width sufficiently longer than the width of the embossed hologram) is arranged at a position (reflection angle) equal to the incident angle of the slit light of the laser. Is sent to the first printing machine located ahead of the licensor camera, and when the printing machine receives a signal that detects the position of the embossed hologram, the embossed hologram portion of the long resin film is printed. Printing to the embossed hologram-corresponding position is started after the time to reach the predetermined position of the machine.

By doing so, at the time of printing of the first (leading) printing press, the print pattern is aligned based on the emboss hologram detection signal from the licensor camera, and the predetermined print pattern is placed on the back side of the hologram forming portion. If printing is performed so as to be on the side, the second and subsequent printing presses can use the well-known and conventional means (for example, registration means using a register mark or a register mark) to form a print pattern by the first printing press. The alignment between the embossed hologram forming portion and the printed pattern can be easily performed only by adjusting the printed pattern of the printing machine to match. (The second and subsequent printing presses may be aligned with the register mark or the like of the immediately preceding printing press.)

In the above licensor camera, when the film surface on which the laser slit light is reflected is a smooth surface, a uniform light-receiving signal is output. However, the film surface on which the laser slit light is reflected has extremely fine irregularities. Since the output of the received light signal is reduced only in the rough surface where the embossed hologram is formed, the position of the embossed hologram forming portion can be detected not only in the running direction of the long resin film but also in the width direction. .

When the printing pattern of the ink used in the first printing press is not at the position corresponding to the hologram forming portion, the ink is not applied to the portion corresponding to the hologram forming portion in the first printing. As described above, the second and subsequent printing presses (or the second and subsequent printing presses are each registered with the register mark of the immediately preceding printing press) in accordance with the printing pattern of the first printing press by known means. As the printing of each color is continued, the printed pattern aligned with the embossed hologram forming portion is printed on the long resin film.

Printing layer 22 formed on long film
Is printed on one or more strips having a non-printed portion with a narrow width on both sides in the longitudinal direction of the printed portion, that is, a repetition pattern of printing (one can) corresponding to a label displaying canned contents and the like. Continuous printing of the same pattern is repeated at the same length as the height of the cylinder), and a plurality of printings (printing for a plurality of cans) are performed in the width direction of the long film with the printing part separated by the non-printing part. ). (As with the print layer 22, the top coat layer 24 is also applied so that the painted portion becomes a plurality of lines across the unpainted portion.)

For continuous printing of the above-described repetitive patterns, it is not always necessary to provide a plurality of stripes, but printing with a plurality of stripes is more effective than printing one stripe at a time. High printing efficiency,
Since the production efficiency when the printed film is attached to the metal plate is high, can manufacturing cost can be reduced.

On the other hand, the method of applying the adhesive is not particularly limited, but when performing gravure printing,
The gravure method is desirable because printing can be performed in a series of operations.

In the case of using a printed film for sticking a can body with an embossed hologram obtained as described above to manufacture a three-piece can printed film-sticked can body having a side seam portion such as a welding can body, Is a conventional method of attaching a printed film (Japanese Patent Laid-Open No. 4-91949,
In the same manner as in JP-A-5-147181, a long (strip-shaped) ultrathin tin-plated steel plate (tin or nickel) having a width slightly longer than the circumferential length of the can body for a plurality of coiled coils (A steel plate may also be used.) And a coil-wound printed and embossed hologram-formed long film are run while being unwound, respectively. At a position immediately before a pair of pressure rolls for overlapping and pressing, the non-printed portion of the printed / hologram-formed film is cut and removed, and then the plated steel sheet and the printed / hologram-formed film are bonded. The layers are overlapped so that the layers are in contact with the plated steel sheet, and the two layers are pressed by a pair of pressure rolls, so that printing and relieving of the three-piece can body material can be performed at high speed and continuously. Film lamination Chakuzumi strip ultrathin tinplate was subjected to full hologram processing can be obtained.

The bonding conditions at this time include a speed of 0 to 300 m / min, a temperature of 140 ° C. to 200 ° C., and a pressure by a pressure roll up to a linear pressure of 250 to 750 N / cm. In order to increase the productivity, it is effective to set the speed to 200 m / min or more.
Although it depends on the heat fusion temperature and the melt viscosity of the adhesive, from the viewpoint of protecting the embossed hologram surface, it is 150 to 170.
° C is preferable, and as for the pressure, a higher one is more effective for the adhesiveness, but in consideration of the dimensional stability, especially when laminating a film that has been printed in advance. 500N because control becomes difficult
/ Cm is preferred.

It is to be noted that the long film for sticking the can body, in which the printed portion is formed into a plurality of strips across the non-printed portion, immediately before being attached to the belt-like ultrathin tin-plated steel plate, Then, after the non-printed portion is cut and removed, a plurality of printed portions are attached to the belt-like ultrathin tin-plated steel plate at a small interval.

Further, with respect to the strip-shaped plated steel sheet for a three-piece can body to which the hologram-forming printed film for sticking a can body is stuck, the surface opposite to the sticking surface of the film is previously determined. A plurality of coatings extending in the longitudinal direction of the plated steel sheet are applied as an inner coat (inner coating film), or become an inner coat simultaneously with or before or after the step of attaching the film to the plated steel sheet. A plurality of thermoplastic synthetic resin films are stuck.

The strip-shaped ultra-thin tin-plated steel sheet for a three-piece can body to which a printing film with an embossed hologram has been attached as described above is first cut into the size of one can body (usually, Next, each of them is hung by a can body forming machine to be formed into a cylindrical shape, and then the overlapped portion is seam-welded by a welding machine to form a can body. After both ends of the can body are subjected to neck-in processing and flange processing by a flanging device, the can body is sent to a can lid tightening device, and a bottom cover is wound around one end of the can body. It becomes a can body with a piece printing can body, this can body is sent to a canning factory, the can body is filled with contents by a conventional method, the opening is sealed with a can lid, and depending on the contents, Canned after heat sterilization It made.

Incidentally, the printing film for sticking a can body with an embossed hologram obtained by the manufacturing method of the present embodiment is not limited to the above-described three-piece can, but may be a metal circle such as an aluminum alloy plate or a surface-treated steel plate. For two-piece cans, which are made of a plate and made of a cylindrical can body and can bottom with no side seams by drawing and ironing, impact processing and drawing redrawing (redrawing) It can also be used for a two-piece can in which a cylindrical can body and a can bottom having no side seam are integrally formed by a stretch process (including a case where stretching is sometimes performed).

More specifically, this point will be described in more detail. In the case where a two-piece can printed film-attached can body having no side seam portion is manufactured by using the above-described can body-attached print film with an embossed hologram, , JP 5
JP-A-2-24798, JP-A-52-24790, JP-A-4-57747, and the like, that is, running while unwinding a printed long film with a coiled embossed hologram. The printing is performed continuously for each can so that the width (length in the horizontal direction of the printed characters and decorative patterns when viewed from the vertical and horizontal directions) is slightly longer than the circumference of the can body. By cutting as a film sheet, a large number of printed film sheets of a size to be stuck to the can body are continuously provided to the printed film sticking apparatus.

The printed film sheet to be stuck on the two-piece can having no side seam portion may have both ends abutting when wound around the can body. The side where both ends overlap is the protection of the can body (even if there is some cutting error of the printing film, the whole circumference of the can body is completely covered with the printing film when pasted. This is preferable from the viewpoint of the following.

When the both ends are overlapped when wrapped around the can body, the printing layer of the can body sticking and printing film with the embossed hologram has a continuous printing (non-printing) in both the longitudinal direction and the width direction. There is no portion. The same applies to the adhesive layer.) However, the portions that are both ends to be overlapped in the can body (particularly, the lower side when they are overlapped) are preferably bonded without the top coat layer. Desirable in terms of power.

In the printing film sticking apparatus provided with the printing film sheet having the size to be stuck to the can body as described above, the printing film sticking device having no side seam portion which is continuously fed while being heated after the forming process. For the bottom cylindrical two-piece can,
Each of the continuously supplied film sheets is adhered to the cylindrical can body of each of the heated can bodies by the adhesive layer 23 and temporarily bonded, and further, with a roll before the adhesive layer 23 is solidified. After being pressed, the adhesive is fully bonded to form a bottomed cylindrical film-adhered can body, which is then sent to subsequent processing steps such as inner surface coating, neck-in processing, and flange processing.

According to the method of manufacturing a can with hologram of the present embodiment as described above, the process of manufacturing a printing film to be applied to a conventional film-attached can, that is, a long film made of thermoplastic resin In the process of continuously forming a printing layer and an adhesive layer, emboss hologram processing can be performed easily and at a high speed, and a printing film for sticking a can body on which such emboss hologram processing has been performed can be formed by a known printing method. A hologram-equipped printing can body can be easily obtained simply by adhering it to the can body portion in the same process as in the case of manufacturing a film adhering can body.

That is, without forming a relief hologram directly on a metal surface of a metal can,
A surface of a resin-made can body sticking printing film 12 to be stuck on the metal plate 11 of the can body (or a metal plate for manufacturing a can body) is relieved in a manufacturing process of the can body sticking printing film 12. Since the mold hologram is formed, it is easy to apply the relief hologram to the can 1, and since the hologram forming surface is made of resin, there is no need to apply a protective coating like a metal surface. Even when forming partially, the alignment with the print pattern can be performed at the time of film printing or hologram formation, so it is very easy and efficient compared to the case of performing on an individual can body, The work efficiency is not significantly reduced by providing the hologram.

Further, the embossed hologram processing is performed on the surface of the resin-made can-body-attached print film 12 constituting the conventional print-film-adhered can body 1 without thermal transfer using a transfer sheet having a hologram-forming layer. Since it is applied, it is not necessary to separately manufacture a transfer sheet, form a base coat layer on the can body of the can body, or perform positioning of the hologram application position and printed pattern for each can,
The number of manufacturing processes is not significantly increased and productivity does not decrease.

As a result, by employing the method of manufacturing a can body with a hologram of this embodiment, a method of forming a relief type hologram directly on a metal surface of a can or a method of forming a relief type hologram using a transfer sheet on a surface of a can body The cost of can making can be reduced as compared with the case of forming a can.

On the other hand, the hologram-provided can body of the present embodiment manufactured through such a manufacturing method is characterized in that the color and pattern of the printing layer 22 formed on the back surface of the resin film 12 are superimposed on the resin film. Since the rainbow-colored hologram 21a (or 24a) formed on the surface of No. 12 is superimposed, even if the hologram is formed simply on a portion having no printed pattern, even if the same portion of the can is viewed,
Depending on the position of the viewer, the rainbow of the hologram or the printed pattern can be seen, giving a strong impression to the viewer.

According to the experiments of the present inventors, the color of the printing ink on the back side of the portion where the hologram was formed was compared with the lightness of dark red, dark brown, dark green, and black (black ink). The hologram effect is high when the target is extremely low, and even when printing is performed with four or less colors on the back side of the resin film, these lightnesses correspond to the upper side of the solid printed portion of the relatively low color. It was found that when a hologram was formed on the surface side of the resin film, the decorative effect of the hologram on the resulting can body was higher.

In the can body with hologram of this embodiment, the printing layer (the normal printing layer is 5 μm or less) is on the back side of the resin film (10 μm or more) which is considerably thicker than the printing layer, and Since the layer is on the front side of the resin film, it becomes a three-dimensional decoration layer with a depth, thereby giving a higher quality feeling. Even if the number of colors of the print layer 22 is reduced, the high quality feeling is lost. There is no.

That is, in conventional multicolor offset printing on a three-piece can steel plate and multicolor gravure printing on a can body sticking resin film, overprinting is possible, so that the number of ink colors is only the three primary colors or black ink. Most of the prints should be possible with the added four colors, but in order to make the decorative print luxurious and luxurious, six to eight more colors are required.
Printing using colors is performed, and multi-color printing is performed directly on a can body by dry offset printing method.
Recently, the use of seven or eight color inks has increased for piece cans.

On the other hand, as described above, the can with hologram of the present embodiment not only has the decorative effect of the printed layer formed on the back surface of the resin film, but also has the viewing angle formed on the front surface of the resin film. Has a decorative effect of a hologram that shines in rainbow colors, so even if printing is performed using four or fewer colors, the decorative effect of the hologram is added to the print effect, resulting in luxury and luxury. When the can is filled with the contents and the can that is sealed by the can lid is displayed at a store, the degree of appeal to consumers is increased.

The fact that the number of colors of the printing layer 22 can be reduced means that the number of inks used for printing can be reduced, and as a result, the time required for changing the printing type is reduced. (Because the number of plates is the same as the number of inks), and the time required for registering the printing pattern of each color plate before printing is also shortened, so that the preparation time for printing can be greatly reduced ( Printing work efficiency is improved)
This leads to the advantage.

Further, in the can body with hologram of the present embodiment, the entire surface or most of the surface of the resin-made can body sticking print film 12 covering the surface of the can body is formed with embossed hologram processing to form an extremely fine unevenness. Is formed, the contact area with the member that comes into contact with the can body surface is reduced, whereby the can body surface on which the resin-made can body attaching print film 12 is adhered is formed. The frictional resistance is small, and the surface of the can body has good lubricity.

Therefore, as shown in the first embodiment,
When the top coat layer containing a lubricant is not provided on the surface of the thermoplastic resin film 21, or when the top coat layer 24 is formed as shown in the second embodiment, the top coat layer 24 is formed therein. Even if the amount of the lubricating agent to be contained is reduced, since the contact area between the can body and the member that comes into contact with the can body is reduced in the conveying path of the can making line and the canning manufacturing line, the frictional resistance is reduced. Good lubricity during transport of cans and cans in the route.

[0081]

According to the can with hologram of the present invention as described above, the hologram that shines in iridescent color is superimposed on the color or pattern of the printed layer depending on the viewing angle, so that the decorative effect is high. A luxurious feeling is obtained, in particular, a hologram is formed on a specific portion of the metal surface by the presence of the printing layer on the back side of the resin film, which is considerably thicker than the printing layer, and the presence of the hologram forming layer on the front side of the film. The decorative layer is thicker and a deeper decorative effect can be obtained as compared with a conventional can body in which printing is applied to other portions.

Further, the presence of the hologram-forming layer on the printing layer can provide a high-grade appearance even when the number of colors of the printing layer is small. Therefore, by reducing the number of colors of the printing layer, the efficiency of the printing operation can be improved. Can be improved.

Further, when the relief type hologram is formed on the entire surface or most of the surface of the can body, the amount of the lubricant contained in the top coat layer on the surface of the resin film can be reduced, or the top containing the lubricant can be further reduced. Even if the coat layer is omitted, the smoothness of the surface of the can body covered with the resin film can be improved, so that the can body or the can body during transportation during can manufacturing operation or canning manufacturing operation can be improved. It is possible to eliminate troubles such as clogging of cans.

Further, according to the manufacturing method of the present invention for manufacturing such a hologram-containing can body, the metal can body can be manufactured without increasing the number of manufacturing steps or greatly reducing the work efficiency. A relief-type hologram can be simply and efficiently formed on the body portion in a good state.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing (A) a part of a can body portion of a can body to which a film is adhered, according to an embodiment (first embodiment) of a can body with a hologram of the present invention, and (B). ) Partial enlarged view of the can body cross section.

FIG. 2 is a partially enlarged cross-sectional view corresponding to FIG. 1B, of another embodiment (second embodiment) of the can body with a hologram of the present invention.

FIG. 3 is a schematic explanatory view showing a manufacturing process of a can body sticking film which is a main part in the method for manufacturing a can body with hologram of the present invention.

FIG. 4 is an explanatory cross-sectional view showing the state of the resin film at each stage of the manufacturing process as shown in FIG. 3 for the can body with hologram of the first embodiment shown in FIG. 1;

FIG. 5 is an explanatory cross-sectional view showing a state of a resin film in each stage of a manufacturing process as shown in FIG. 3 for the can body with hologram of the second embodiment shown in FIG. 2;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Metal plate (can body part of can body) 2 Film sheet 21 Thermoplastic resin film 22 Printing layer 23 Adhesive layer 24 Top coat layer

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[Procedure amendment]

[Submission date] June 30, 1997

[Procedure amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0052

[Correction method] Change

[Correction contents]

[0052] At the same time, it should be placed in the position of the incident angle and the angle of the slit light laser line sensor camera (reflection angle) (with sufficiently long width than embossed holograms), line sensors The signal from the camera is
To the first printing press located ahead of the sensor camera, and when the printing press receives a signal that has detected the position of the embossed hologram, the embossed hologram portion of the long resin film moves to the specified position on the printing press. The printing at the position corresponding to the embossed hologram is started after the time to reach.

[Procedure amendment 3]

[Document name to be amended] Statement

[Correction target item name] 0053

[Correction method] Change

[Correction contents]

[0053] In doing so, at the time of printing of the printing machine for the first (top), and the alignment of the print pattern on the basis of the embossed hologram detection signal from the line cell down Sir camera,
If printing is performed so that the predetermined printed pattern is on the back side of the hologram formation location, the second and subsequent printing presses use well-known and customary means (eg, register means using register marks or register marks). By simply adjusting the printing pattern of the first printing press to match the printing pattern of the first printing press, the position of the embossed hologram forming portion and the printing pattern can be easily adjusted. (The second and subsequent printing presses may be aligned with the register mark or the like of the immediately preceding printing press.)

[Procedure amendment 4]

[Document name to be amended] Statement

[Correction target item name] 0054

[Correction method] Change

[Correction contents]

[0054] In the above line sensor camera, when the film surface where the slit light laser is reflected smooth surface is output uniform light reception signal, the film surface where the slit light laser is reflected is very fine If the surface is rough such that irregularities are formed, the output of the received light signal is reduced only in that portion, so that the position of the embossed hologram formation location can be detected not only in the running direction of the long resin film but also in the width direction. is there.

Claims (6)

[Claims] 1. A transparent thermoplastic resin film having a printing layer provided on one surface thereof is bonded to an outer peripheral surface of a can body by thermal bonding via an adhesive layer provided so as to cover the printing layer. In the attached film sticking can body, the surface of the thermoplastic resin film on the side opposite to the side on which the printing layer is applied is partially or entirely relieved by irregularities at extremely fine intervals. A can body with a hologram, wherein a can-shaped hologram is formed. 2. A printing layer is applied to the surface on one side,
A transparent thermoplastic resin film having a transparent thermosetting resin-containing top coat layer containing a lubricant on the surface on the other side is provided with an adhesive layer provided so as to cover the print layer. In the film sticking can body stuck to the outer peripheral surface of the trunk by thermal bonding, a relief hologram is formed by unevenness at extremely fine intervals, partially or entirely, on the surface of the top coat layer. A can body with a hologram, characterized in that: 3. A step of sequentially applying a printing layer of a printing ink and an adhesive layer of an adhesive on one surface of a long transparent thermoplastic resin film to form a printing film for sticking on a can body. A step of heating and bonding the printing film for sticking a can body to a long metal plate for a can body via the adhesive layer, and cutting the metal sheet for a can body to which the printing film for sticking a can body has been attached; Step of cutting into can body blanks of a minute size, Can body forming step of rolling the can body blank by a can body forming machine and overlapping both ends, and joining to join the overlapping portion of the can body In the method for producing a can body having a side seam portion, the step of forming the can body sticking print film, the surface of the thermoplastic resin film opposite to the print layer forming side. , Relief-type holograms with microscopic irregularities A method for manufacturing a can body with a hologram, comprising forming a relief hologram on the surface of the thermoplastic resin film by pressing a roll type hologram stamper formed on at least a part of a cylindrical surface. 4. A step of sequentially applying a printing layer made of a printing ink and an adhesive layer made of an adhesive on one surface of a long transparent thermoplastic resin film to form a can body sticking printing film; Cutting the print film for attaching the can body to the size of one can, manufacturing a can body without side seam portions from the metal plate for can body manufacturing, and removing the can body without the side seam portions After heating, one can of can body sticking print film,
Attaching the film to the body of the can body by wrapping the film around the body of the can body so that the adhesive layer comes into contact with the can body, and applying pressure thereto. In the method for manufacturing a body, in the step of forming the printing film for pasting a can body, a relief hologram having irregularities with extremely fine intervals is formed on the surface of the thermoplastic resin film opposite to the printing layer forming side. A method of manufacturing a can body with a hologram, comprising forming a relief hologram on the surface of the thermoplastic resin film by pressing a roll-type hologram stamper formed on at least a part of a cylindrical surface. 5. A transparent thermosetting resin coating containing a lubricant is applied in advance to a surface of a transparent thermoplastic resin film on which a relief-type hologram is to be formed, and dried to form a top coat layer. The method for producing a can body with a hologram according to claim 3, wherein the can body is formed. 6. The printing on a transparent thermoplastic resin film is a continuous printing of a repetitive pattern extending in a longitudinal direction of the long film, and a non-printing portion having a narrow width is provided on both sides of the continuous printing portion. 4. A method according to claim 3, wherein a plurality of said continuous printing portions are provided with a non-printing portion therebetween.
6. The method for producing a can with hologram according to any one of items 1 to 5.